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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Will adding a Walbro even matter until I flash the DME?



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      04-24-2013, 05:34 PM   #1
KaiserN54
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Will adding a Walbro even matter until I flash the DME?

Car is FBO running procede non flex fuel E85 maps. I am getting a Walbro installed next week but can't get my DME flashed until sometime later. Will it even make a difference in terms of fuel trims, etc, until I do? My car would be very enjoyable if it stopped dropping timing all the time (on 50/50) or trimming out (on 50%+ E85)
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      04-24-2013, 07:01 PM   #2
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So....no one knows?
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      04-24-2013, 07:21 PM   #3
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Do you have logs? If you're maxing trims then it won't help. If your fuel pressure is dropping you would normally get a LPFP code. So if you don't have any codes, you're probably going lean due to OL trim.
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      04-24-2013, 07:23 PM   #4
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Quote:
Originally Posted by Wedge1967 View Post
Do you have logs? If you're maxing trims then it won't help. If your fuel pressure is dropping you would normally get a LPFP code. So if you don't have any codes, you're probably going lean due to OL trim.
OL Trim is set at 100%
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      04-25-2013, 08:22 AM   #5
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Quote:
Originally Posted by KaiserN54 View Post
OL Trim is set at 100%
Ok, but that doesn't mean anything. What is your logs say your OL trims are doing at WOT?

The flash is what fixes the trims by opening up fueling. The LPFP will only fix the pressure and volume demands when you go higher than 50/50.
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      04-25-2013, 09:54 AM   #6
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Quote:
Originally Posted by Wedge1967
Quote:
Originally Posted by KaiserN54 View Post
OL Trim is set at 100%
Ok, but that doesn't mean anything. What is your logs say your OL trims are doing at WOT?

The flash is what fixes the trims by opening up fueling. The LPFP will only fix the pressure and volume demands when you go higher than 50/50.
okay, thats what i wanted to know. i was debating getting my car up on the dyno while it is at the shop...sounds like i should wait until after i get the flash. thanks wedge
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